Package com.alibaba.dcm.internal

Class InetAddressCacheUtilForJdk8Minus

java.lang.Object

com.alibaba.dcm.internal.InetAddressCacheUtilForJdk8Minus

public class InetAddressCacheUtilForJdk8Minus
extends Object

Util class to manipulate dns cache for JDK 8-.

dns cache is InetAddress.Cache#cache in InetAddress#addressCache.

Caution:
Manipulation on InetAddress#addressCache MUST be guarded by InetAddress#addressCache to avoid multithreading problem, you can see the implementation of InetAddress to confirm this (See Also lists key code of InetAddress related to this point).

Author:

Jerry Lee (oldratlee at gmail dot com)

See Also:

InetAddress, InetAddress#addressCache, InetAddress.CacheEntry, InetAddress#cacheInitIfNeeded(), InetAddress#cacheAddresses(String, InetAddress[], boolean)

Method Summary

Modifier and Type	Method	Description
static void	clearInetAddressCache()
static DnsCacheEntry	getInetAddressCache(String host)
static DnsCache	listInetAddressCache()
static void	removeInetAddressCache(String host)
static void	setInetAddressCache(String host, String[] ips, long expireMillis)	Need convert host to lowercase, see InetAddress#cacheAddresses(String, InetAddress[], boolean).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

setInetAddressCache

public static void setInetAddressCache(String host,
                                       String[] ips,
                                       long expireMillis)
                                throws UnknownHostException,
                                       IllegalAccessException,
                                       InstantiationException,
                                       InvocationTargetException,
                                       ClassNotFoundException,
                                       NoSuchFieldException

Need convert host to lowercase, see InetAddress#cacheAddresses(String, InetAddress[], boolean).

Throws:

UnknownHostException

IllegalAccessException

InstantiationException

InvocationTargetException

ClassNotFoundException

NoSuchFieldException

removeInetAddressCache

public static void removeInetAddressCache(String host)
                                   throws NoSuchFieldException,
                                          IllegalAccessException

Throws:

NoSuchFieldException

IllegalAccessException

getInetAddressCache

@Nullable
public static DnsCacheEntry getInetAddressCache(String host)
                                         throws NoSuchFieldException,
                                                IllegalAccessException

Throws:

NoSuchFieldException

IllegalAccessException

listInetAddressCache

public static DnsCache listInetAddressCache()
                                     throws NoSuchFieldException,
                                            IllegalAccessException

Throws:

NoSuchFieldException

IllegalAccessException

clearInetAddressCache

public static void clearInetAddressCache()
                                  throws NoSuchFieldException,
                                         IllegalAccessException

Throws:

NoSuchFieldException

IllegalAccessException